Sealing composition for transparentized paper



Patented July 21, 1953 I SEALING COMPOSITION FOR TRANS- PARENTIZED PAPER Robert R. Parmentier, Upper Darby, Pa.

No Drawing. Original application April 12, 1950,

Serial-No. 155,565. Divided and this application October 18, 1950, Serial No. 190,882

This invention relates to compositions and processes for transparentizing fibrousmaterials such as paper.

It is often desired to reproduce copies of drawings, printed pages, or other similar materials.-'

This may be accomplished by photographing the drawing and preparing'prints from the so-obtained negative. A further method is to prepare prints directly fromsuch page or drawing. In this latter method, the paper in general use is too opaque to permit the preparation of satisfactory prints, and in the photographic process the cost of the reproduction makes the process prohibitive in many instances; In order to overcome these and other diiiiculties, it has heretofore been suggested to employ various compositions in order to transparentize the paper from which reproductions are desired, and thus render the attainment of prints directly therefrom feasible. Compositions heretofore 'proposed,"however, have serious.

3 Claims. (01. 106271) sponge saturated with the transparentizing solution. Other'means of application may be employed, such as spraying, brushing, and dipping.

The composition of the present invention drys in a very short time, within about 2-5 minutes, and. the so-treated paper may then 'be'used in preparing photographic reproductions. It is preferred, however, to further treat the paper with a novel composition comprising wax, 2-6 vol. a gasoline hydrocarbon fraction; 31-47 vol. andcarhon tetrachloride, 47-67 vol. The process of transparentizing and sealing papers with the described compositions is described and claimed in my copending application Serial. Number 190,883, filed October 18, 1950. Using the. stated ranges of gasoline and carbon tetrachloride, a saturated solution of the wax, at about room temperature,

disadvantages which greatly restrict or prevent their use. For example, compositions heretofore proposed suffer one or more of the following difficulties: the compositions may be dangerous to compound, and use, are dinicult to prepare and apply to the paper, drying thereof is slow, the material used in transparentizing, usually an oil, is transferred to prints and other papers which it contacts thus restricting its use and making storage 01 the treated paper difficult, odor is imparted to, the treated paper which makes its use obnoxious and which permeates other'papers and materials such as when stored together, tacking, i; e., sticking of the treated paper to hot surfaces of reproducing machines, which prevents or greatly limits their use in most processes, and lack of good transparentizing thus preventing the attainment of suitable reproductions,

An object of the present invention is toprovide compositions effective to transparentize paper and obviate the above-mentioned difficulties. A

further object is to provide a process for'transv parentizing papers.

'invention comprises mineral oil, 10-35 vol.

toluene, 4- 10 vol. and carbon tetrachloride,

. 55-80 vol. This composition is applied directly to the paper to be transparentized, preferably to the side thereof which does not contain the printed matter or drawing the reproduction of which is desired. Application isconveniently accomplished by rubbing the paper with a cloth or parentizing solution is completely dry.

may advantageously be employed. It has been found that this composition effectively seals the paper so that no seepage is apparent even after longstorage, and also provides other advantages as hereinafter described. 'The sealing composition may be applied in the same manner as described for the transparenti'zing composition.

In transparentizing paper in accordancewith the present invention, the transparentizing solution maybe applied to the paper and after drying the sealing solution applied. It is preferred to apply the sealing composition before the trans- It has been found that operating in this manner the total time of application of the solutions is considerably decreased, the sealing solution is more readily applied, and total drying time is decreased. a

In the above-described transparentizing composition, it is possible to substitute xylene, usually ployed is preferably a refined White'mineral oil boiling in the lubricating oil range. The wax employed in the sealing solution is preferably a parafiin wax of petroleum origin having a melting ranges for the ingredients of both compositions i pbfie ved. With respect to the transparentizing composition, if mineral oil be employed in less than the stated amount, the paper is not sufficiently transparentized to permit satisfactory reproduction, whereas if more than the stated quantity is employed, the paper will be slow drying and seepage occurs; if less than the stated amount of toluene is employed seepage is observed, whereas if more than the stated quantity is employed the composition may be inflammable and has an offensive odor; if carbon tetrachloride is employed in less than the stated quantity, penetration of the paper by the transparentizing composition is decreased thereby making the appli-cation of the composition difiicult, and the composition may be inflammable, whereas employing more than the stated quantity results in too fast drying which makes its application to paper diflicult and uneven. With respect to the sealing composition, if less than the stated quantity of wax is employed, efiective sealing will not be obtained so that seepage is observed, whereas if more than the stated quantity is employed, tacking during the reproduction operation is observed; if less than the stated quantity of gasoline is employed the wax will not be sufiiciently soluble in the composition to achieve the desired results, Whereas more than the stated quantity may render the composition inflammable; the same disadvantages of employing a quantity of carbon tetrachloride outside of the stated range is observed with the sealing composition as with the transparentizing composition.

Various papers may be treated in accordance with the present process, and the so-treated papers used in various reproduction processes. Papers which may be treated for example include the usual bond paper of say about 13 to 24.- lb. weight per 1000 sheets, photographic, tracing, chart, and blue print papers, and in general any paper except very heavy fibrous materials such as cardboard. The treated papers may be employed for making reproductions in a variety of processes involving the transmission of light through the treated paper. As illustrative of such processes may be mentioned direct printing such as contact box printing, the use of Ozalid,

Bruning, blue print machines, and actinic light contact printing. The treated papers may also be used in projection printing.

The following examples illustrate preferred embodiments of the present invention and the superiority of the present compositions and processes over those heretofore known:

Example 1 solutions was prepared and tested. The compositions prepared were as follows (parts given as parts by volume) 1 Composition 1:

Castor oil 1 Turpentine 1 Composition 2:

It will be noted that Compositions 5 and 6 are the present transparentizer and sealing compositions, respectively. In composition 6, the gasoline fraction employed was a straight run fraction boiling between about 190 F. and 380 F., and the wax employed was a paraffin wax having a melting point of 150F. (A. S. T. M. 13-87-42 method). Data obtained are presented in the following table, which gives the following data: (1) application, which is the ease of application of the composition to the papera measure of the rubbing time required to apply the composition; (2) drying, which is the time required for the treated paper to dry; (3) odor, which is the odor of the treated paper after standing 6 days; (4) seepage, which is the tendency of the oil to rise to the surface of the paper, observed by transfer of oil from the treated paper to a contacting paper on standing 24 hours; and (5) transparency of the product, i. e., whether sufficient light will be transmitted through the paper In order to demonstrate superiority of the presto obtain good contact photoprints.

Composi- 1 Transtlon Apphcatlon Drying Odor Seepage parency very difiicult-. very slow... strong serious good.

drflicult OW ..d0 very serious. fair.

moderate moderate do .do poor.

-. -.do slow ..do. moderate.... fair.

st. dsl1ght.. vcryslight.. good.

1 Drying times were as follows: Very slow= minutes' slow=2 I mod erateifflto dminllte; fast=25 minutes. J 0 60 mmutes aper rea e wi om osition5followed in 10 minut ft mgr? wit Cognpositijon 6. p G5 (a er dlymg) by We aper rea ed Wit Composition 5 followed immediatel b f ment with Composition 6. y e Ore d1 ymg) by treat ent compositions over those heretofore described, and of the necessity of using the described in- As noted above, Composition 5 is the transparentizer and Composition 6 the sealer of the gredients in the present compositions, a series of present invention. It is apparent that Composi- 'tion 6 as described for Example 1.

. tion 6 acts to transparentize paper, but gives only a fair product. The last two lines of the table represent preferred processes of the present invention, and show the excellent results achieved.

' Example 2 In order to illustrate a preferred embodiment of the present process, it was desired to reproduce copies of an engineering drawing of size 30 by 41 inches, the size of the desired copies being 11 by 15 1 The original'drawing was photographed and a print of the desired size made on an opaque photographic'paper from the negative.

This print was transparentized and sealed using the compositions of the present invention as described, applying the sealing composition after drying of the transparentizing composition. The transparentized photo-print was then employed in an Ozalid machine to produce the desired number of prints, excellent results being achieved.

I Example 3 It was desired to produce copies of a type-- written report. The papers were transparentized and sealed in accordance with, the present process and. copies made directly therefrom on an Ozalid machine.

Untreated paper was tested against the transparentized paper and it was found that the speed of the machine using transparentized paper was increased from 2 to 4 times, and that the prints were sharper and contained greater contrast than those obtained with the untreated paper.

7 Example 4 Composition 5 of Examplel was duplicated except that benzene was substituted for toluene. A

blue-print of an engineering drawing was transparentized therewith and sealed with Composi- Substantially identical results were obtained as with toluene.

7 Example 5 Example 4 was repeated using a mixture of xylenes in place of toluene.v Results substantially identical to those obtained in Example 4 were obtained.

Example 6 Six commercial transparentizers were purchased and results obtained therewith compared from 31-47 vol. of a gasoline hydrocarbon fraction, and from 47-437 V01. carbon tetrachloride.

2; A composition or matter consisting of 2-6 vol. petroleum wax having a melting point of from F. to 200 F from 31-4-7 vol. of an aliphatic hydrocarbon boiling within the gasoline range, and from 47-67 vol. carbon tetrachloride.

,3. A sealing composition according to claim 1 wherein said. gasoline hydrocarbon fraction is a dearomatized gasoline hydrocarbon fraction.

ROBERT R. PARMENTIER.

References Cited in the file of this patent .UNITED STATES PA'I'ENTS Number Name Date 1,535,999 Harrington Apr. 28, 1925 FOREIGN PATENTS Number "Country Date 7 556,820 France July 27, 1923 

1. A SEALING COMPOSITION FOR TRANSPARENTIZED PAPER, COMPRISING 2-6 VOL. % PETROLEUM WAX HAVING A MELTING POINT OF FROM 115* F. TO 200* F., FROM 31-47 VOL. % OF A GASOLINE HYDROCARBON FRACTION, AND FROM 47-67 VOL. % CARBON TETRACHLORIDE. 